<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
  <rect x="50" y="50" width="130" height="130" rx="15" fill="rgba(0,0,255,0.5)"/>
  <!-- cover center of first rect -->
  <rect x="65" y="65" width="100" height="100" fill="white"/>
</svg>
